Crucible-furnace.



H. KOCH.

URUOIBLE FURNACE.

APPLICATION IILED 1330.19, 1911. RENEWED JULY 26, ms.

1,073,912. Patented Sept; 23, 1913.

CGLUMBIA PLANuanAPM 20.. WASHINGTON. D. C.

more

HANS KOCH, 0F DIETIKON, ZURICH, SWITZERLAND.

CRUCIBLE-FURNACE.

Specification of Letters Patent.

'latontcd Sept. 23, .1913.

Application filed December 19, 1911, Serial No. 666,740. Renewed July 25, 1913. Serial No. 781,253.

To all whom it may concern:

Be it known that 1, films Kooii, a citizen of the Republic of Switzerland, and a resident of Dietilion, in the Canton of Zurich, Switzerland, have invented new and useful Improvements in Crucible l urnaces, of which the following is a specification.

One of the objects of my invention is to provide a crucible furnace wherein the fur nace structure is formed in sections and mounted to be swung into a position to surround the crucible and also away from the crucible so as to leave the latter free to be removed by the usual form of carrier, thereby avoiding the employment of lilting tongs.

My invention has further features of novcity which will be described in connection with the accompanying drawing and more particularly pointed out in the appended claims.

In the drawing :-Figure l is a vertical, sectional view of one form of my invention sl'iowing the furnace structure, composed of sections, in a closed position surrouiuling the crucible, and in dotted lines in an open position. Fig. 2 is a plan view of the structure shown in Fig. 1. Fig. 3 is a detailed sectional view of a portion of the grate of the furnace, illustrating the manner of mounting the same in the furnace. Fig. lis a detailed sectional view on lines .l-4lof Fig. 1 showing the manner of raising the cap flue prior to swinging the same from the full line to the dotted line position as shown in Fig. 1.

Like characters of reference designate similar parts throughout the different tigures of the drawing.

As illustrated, a designates a chamber structure which communicates with a source of supply of compressed air by means of a pipe 6. The chamber structure a carries an upright or standard 0, preferably in the form of a pipe, and communicates with said standard 0 at a. The standard 0 has outlets 0 which deliver the air supply, as indicated by the arrow, to the ash pit 0 of the furnace. 011 standard 0 is mounted a suitable block crucible support 0, which is made of any suitable fireproof material, such as graphite. The crucible block 0 is preferably mounted on the support or standard c in a manner to be readily removed therefrom.

(l indicates the crucible which is mounted upon the block 0" and 0 indicates the cruciblc carrier, the annular part c of which is adapted to be lowered about the standard 0 to restupon the chamber structure a, as clearly shown in Fig. 1.

The furnace is formed of sections 7c and m which are mounted to be swung about a pintle shaft g, mounted in a suitable bearing f in the chamber structure a. The lower end of the shaft y is rigidly secured in the structure a by a suitable fastening device 5 which rigidly engages a shouldered portion against structure a. The sections is and m have upper bearings 70' and ill and lower bearings /i:-' and at. The lower bearings are provided with ant i-friction devices i and it, of any suitable form.

Above the furnace is mounted the usual cap line or heater '11 having linings o and o as shown, and a sleeve 1) mounted upon the pintle shaft 9. As illustrated in Fig. 41-, the shafts '10 are provided with eccentric portions to, which engage the sleeve 0: and serve to slightly elevate the part 4)" to facilitate n'ioving the same to and from the full line position shown in Fig. 1. A hand wheel w is provided for actuating the shaft it).

Next referring to the furnace, the same consists of the outer shells provided with suitable linings p which are held in the shell sectirm by angle irons 7). The combastion chamber a of the furnace is divided from the ash pit o by a grate structure which may consist of grate bars 1 having lugs 1 adapted to fit into pockets or recesses 0, in the furnace structure, as clearly shown in Fig. 3. As will be seen in Fig. 52, the outermost grate. bars of the opposite sections Z: and m practically meet, and the inner grate bars project toward the crucible block (1" in a manner to form a continuous grate surface for the. fuel which will be disposed on the grate and extended up about the crucible in the combustion chamber a. The air supply is delivered from the standard 0 through the openings 0 to the ash pit at a point below the grate bars, as will be clearly seen from reference to Fig. 1. A ring a is mounted on the standard a so that when the furnace se tions are brought together into a closed position surrounding the crucible, as illustrated in Fig. 1, the lower margins'of the ash pit will abut against theupp'er surface of'the ring a and against the outer surface of the standard 0 so as t oprev'ent' the air from escaping from the ash p1t. The abutting portions of the shells of the furnaceiaand m are provided with recesses T which may" be filledwith-clay or anysuitable material to form-a tight joint. Lugs 3 and s and suitable fastening devices s, t andt are provided to lock the furnace sections 70 and m together into the closed position shown in Fig. 2.

. In order to'prevent the furnace structures in and m from cooling off when swung into an open position as shown in dotted lines in F 2, andalso inorder to retain that portion of the fuelbed, not having fallen out, and to maintain the fuel bed in a state ofactive combustion and retain the heat as much as possible, I preferably provide closures a, which may be hinged at g on the sections is and m, and which are swung into a closedposition as shown in the lower half section m, in Fig.

2, when the sections are open. The closuresaa may be fiat "platedike members made of asbestos or other suitable material;

In operation, with parts in the dotted line position shown in Fig. 2, the crucible d will first be placed upon the block 0". by

means of the carrier 6, and then the latter will be lowered withthe hooked or annular portion'e surrounding the standard 0 and resting upon the chamber a, as shown in Fig.1; Then the furnace sections 76 and m are swung into a closed position, as shown in full lines in Fig. 2, and the fastening devices are locked and the joints properly made at 1. Fuel is filled in the combustion chamber up to a point adjacent the upper rim of the crucible and the latter is char ed with the material to be melted.

The part b is then swung into the full line position shown in Fig. 1 and the fuel is lighted and combustion is maintained by the air supply, h reinbefore described. When the metal has been melted, the part b is slightly lifted by the hand wheel to and swung into the dotted line position. Then the furnace sections 70 and m are swung into the open position and the crucible is ready to be lifted off by raising the carrier 6- into the dotted line position shown in Fig. 1. vIt will thus be seen that the 'mounting of the furnace sections at one side of'the furnace structure, permits the latter to be completely withdrawn from the crucible so that the latter can be placed upon Copies of this patent may be obtained for ample and taken from its support without the use of lifting tongs.

I claim 1. ri'crucible furnace comprising in combination, a hollow crucible supporting structure communicatingwith an air supply, a

crucible carried by said supporting struc- 'ture,'vertical companion furnace sections each having registering furnace chambers horizontalash pit and grate port1ons',and

' hinged supporting means for said sections portions adapted to register, respectively,

andhinged supporting means for'said sections whereby the same may be swung" into and out of surroundlng relation with said crucible, substantially as described.

3. -A crucible furnace comprising in combination, a crucible support, a crucible mounted on sa1d,;support, companlon furnace sections, hinged supporting means for said sections whereby the same may be swung into and out of surrounding relation with said crucible, and means for closing said sections when in an open position, sub stantially as described.

4:. A crucible furnace comprising in com bination, a crucible support, a crucible mounted on said support, companion furnace sections, hinged supporting means for said sections whereby the same may be swung into and out ofsurrounding relation with said crucible, and "doors on said sections for closing the same when in an open position, substantially as described.

5. A crucible furnace comprising in combination, a crucible support, a crucible mounted on said support, companion fur nace sections having furnace chamber portions adapted .toregister and horizontalremovable grate portions adapted to register, and hinged supporting means for said sections whereby the same may be swung into and out of surrounding relation witlr re' spect to said crucible, substantially as def scribed.

Signed by me at Zurich, Switzerland,

this 29th day of November 1911 HANS KOCH Witnesses: 1

CARL MI l'LLER,

CARL GUBLER. I V

fi-ve cents eachyby addressing the Commissioner of Patents, Washington, II/U. Q 

